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Made in 1999 so they are not young or real old. Those don't usually get louder with age but it should be checked by a Pro. Freon level needs checking etc. Usually I sit them on some rubber to absorb the vibes. If it is low on Freon the compressor can get damaged and your cooling goes down and elec goes up.

15 yrs use in Miami is LOTS and you should budget for new ones but some of those Lennox units can easily go more than 20 yrs. Get it properly checked and it may last another 5 yrs.

At 15 yrs old the fan motor is worn and in your climate has several yrs more wear than the average unit. Probably needs a new motor and most of them are sealed and non lubricateable. Post a video on U Tube with the sound of it. Don't know about the blanket.

About the blanket:
I've got a 13 SEER Goodman with Copeland scroll and a cheap stamped fan. With a Rheem 68-23427-26 blanket on it (fits 1.5-3 ton Copeland) I can barely hear the compressor because the fan is louder than the compressor. I'm not sure what it would be like if I had a quieter fan, but my compressor is no longer a factor in outdoor noise.

Also, make sure it's the outdoor unit you hear and not the lineset transferring vibration to the house.

At 15 yrs old the fan motor is worn and in your climate has several yrs more wear than the average unit. Probably needs a new motor and most of them are sealed and non lubricateable. Post a video on U Tube with the sound of it. Don't know about the blanket.

the first one is the noise I hear when standing inside the room looking at the compressor outside.

the next one is the noise made by the compressor outside. I deliberately move around the unit, up and down, so you can hear the difference. You can also see the concrete pad the unit sits on is not touching the building structure.

The entire outside unit is called a condenser. Inside it sits the compressor and on top is the condenser fan motor. What exactly is the problem? From the looks of it, just the condenser fan motor is the problem. Those are around $100-$200 and an easy DIY swap. Are you saying the compressor inside is making the noise?

Replacing the entire outside unit will also mean replacing the evaporator inside your home. You are looking at many, many thousands to replace the entire thing.